我如何在JavaScript中实现断言？ [英] How do I implement assertions in JavaScript?

问题描述

我想使用断言来检查我的私有方法中的无效参数（以及其他只应在内部调用的参数）。我更喜欢：

• 失败的断言终止程序，或者至少停止我的自动化测试。 console.assert（）似乎没有这样做。


• 生产部署过程中可以剥离断言Grunt）。


• 一个非常小的解决方案（不需要库来做到这一点）。

编辑：
我不想在这里测试任何东西。如果我的动机不明确，请查看CC2或Clean Code或Wiki页面： https： //en.wikipedia.org/wiki/Assertion_(software_development）

解决方案

类似于？

  const assert = env ===production
？ （）=> {} 
：（test，msg）=> {
 if（！test）抛出新的错误（`assertion failed：$ {msg}`）; 
}; 
 
 ... 
 
函数foo（param）{
 assert（typeof param ===number，param is a Number）; 
} 
  

I'd like to use assertions to check for invalid parameters in my private methods (and others that should only be called internally). I'd prefer:

• A failed assertion terminates the program, or at least stops my automated tests. console.assert() doesn't appear to do this.
• Assertions can be stripped out during production deployment (I'm using Grunt).
• A very minimal solution (shouldn't need a library to do this).

EDIT: I'm not trying to test anything here. If my motivation for doing this is unclear, check out CC2 or Clean Code or the Wiki page: https://en.wikipedia.org/wiki/Assertion_(software_development)

解决方案

Something like?

const assert = env === "production"
    ? () => {}
    : (test, msg) =>  {
        if (!test) throw new Error(`assertion failed: ${msg}`);
      };

// ...

function foo(param) {
    assert(typeof param === "number", "param is a Number");
}

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